TITLES. 
Ins. 43 
345. Trybom, F. Insekter och andra lagre djur, funna vid fiottadt 
timmer och bland aff all fran sadant. Ent. Tidskr. vi. pp. 161-168. 
The observations relate to wood floated down by streams, and are of 
considerable interest. A resume in French is given, t. c. p. 216. 
r 
346. Viallanes, H. Etudes hiatologiques et organologiques sur les 
centres nerve ax et les organes des sens des animaux articules. Troi- 
sieme memoire : Le ganglion optique de quelques larves de Dipteres 
(. Musca , Eristalis, Stratiomys). Ann. Sci. Nat. (6) xix. Art. 4, 
pp. 1-34, pis. i. & ii. 
The two plates are gUen to the optic ganglion of Eristalis . Ihe 
paper, as may be inferred from the title, is devoted to minute histology, 
and the author dwells on and elucidates the fact that the visual organs 
deeply placed in the interior of the larva exist for the future formation 
of the highly-developed optical apparatus of the perfect insect. 
347. --. Sur la structure interne du ganglion optique de quelques 
larves de Dipteres (Musca, Eristalis, Stratiomys ). Bull. Soc. Philom. 
(7)ix. pp. 75-78. 
This is a resume not amenable to abbreviation. 
348. Wailly, A. Educations d'Attaciens sericigenes faites a Norbiton 
en 1884. [ Lepidoptera .] Bull. Soc. Acclim. (4) ii. pp. 410-422. 
Gives information as to hybrids in Platysamia ceanothi and P. cecropia ; 
and between Anthercea pernyi and A. roylei. 
349. Walker, A. 0. Climatic Causes affecting the Distribution of 
Lepidoptera in Great Britain. P. Chest, Soc, N, S. No. 3, 
pp. 62-68. 
350. Walsingham [Lord]. On some Probable Causes of a Tendency to 
Melanie Variation in Lepidoptera of High Latitudes ; being the 
Annual Address of the President to the Members of the Yorkshire 
Naturalist’s Union, March 3rd, 1885, at Doncaster. Tr, Yorksh. Union, 
pt. 8, pp. 113-140. 
The complex nature of the problem is well illustrated by this memoir. 
After consideration of the views that have previously been expressed, he 
suggests the new idea that where the sun’s rays are deficient, the darkest- 
coloured male individuals would, by their superior powers of heat-absorp¬ 
tion, become most active, and therefore would most likely pair with the 
female. The relations to heat were tested by exposing differently- 
coloured insects on snow during sunshine. [ Cf . Nature, xxxi. p. 505.] 
351. -. Contributions to the Knowledge of the Genus Anaphe, Walk, 
[Lepidoptera.] Tr. L. S. (2) ii. pp. 421-426, pis. xliv. & xlv. 
Larvae, pupae, perfect insects, and dipterous parasite figured. The 
insects were reared in the Insectarium of the Zoological Society’s Gardens, 
London. 
352. -. Characters of Two New Genera of Pterophoridee, from Speci¬ 
mens in the British Museum. Ent. M. M. xxi.pp. 175 & 176, wood- 
cuts. [ Lepidoptera from Ceylon and Australia.] 
